Press



March 12, 1929.

L. D. NILSON PRESS 3 Sheet-Sheet 1 Filed Nov. 11, 1926 weary z wezzfor I "flew/2am a? 2227:022-., i; fly}; QMzze r March 12, 1929. u sou 1,705,461

- PRESS Filed Nov. 11. 1926 3 Sheets-Sheet 3 W 21; may 9%fiim/Warzzz .r

March 12, 1929. L, D, NILSON 1,705,461

' PRESS Filed Nov. 11,1926 3 Sheets-Sheet 5 Patented Mar. 12, 1929.

UNITED; TA-res Parr T FEE- LEONARD n. NILSON, or WAYZATA, 'MINNESOTA, assrelvon TO Martarrra'rn-Mirna FACTURING COMPANY, or sr. PAUL, ivnnnnso'ra. Y

rnnss.

Application filed November 11, 1926. Serial No. 147,694.

The object of my invent-ion is to provide a press particularly adapted for use in connection with garage automotive work and being simple and durable and comparatively ineX- pensive tomanufacture.

' lore particularly it is my object to provide a press for garage worln-such as straightening disk wheels, crank shafts, cam shafts and the like and for use in connection with re.- moving and replacing pins, keys and gears. A further object is to provide my pressof substantial construction with a press screw of sturdy construction adapted to have fittings for different kinds applied thereto for garage work of diflterent kinds- 7 till a further object is to provide a work table which is readily and conveniently .ad justable as to height for the different kinds of work encountered and readily adapted to receive fittings employed in the use of automotive repairs, the table being guidingly held in position by the press frame and locked in any of its adjusted positions by the use'of latch mechanisms. A further object is to provide suitable operating mechanism for actuating the press screw employing bevel gearsoperatively con-v nected; i i

Still a further object is to provide reduction gear mechanism whereby the press screw may be operated selectively at either a high or low speed and to provide a convenient means which is readily accessible to the operator 01 the press for adjusting the operating mechanism for high or low speed operation. Another object is toprovide a handle for actuating the operating mechanism anda reversible ratcheting means for connecting the handle thereto.

Nith these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my press, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings in which: Figure 1 is a side elevation of my improved press showingsome of the. fittings for handling different classes of work inpos'itio thereon. M 7 Figure 2is an end elevation of the same.

Figure 3 is a vertical detail sectional view 7 taken on the line 33 of Figure 2, theparts being enlarged to better illustratethe con? struction of my device.

F lgure 4; 1s a further enlarged detal sec,-

tional view on the line l.-t of Figure 3 illus- I trating part of the mechanism for operating the press screw. Figure 5 1s a detail sectional View on the line 55 of Figure 3 illustrating part of the reductlon gear mechanism.

Figure 8 is a detail sectional view taken on i the line 88 of Figure 1 showing the applicationof fittingsused with the press. I Figure 9is a'detail sectional view-on the line 99 of Figure 8 illustrating part of the ratchet mechanism; and 1 1 FigurelO is a detail sectional view the llne 1010 of Figure 3.

My improved press includesa pair of. vertical s1de members .10 which are of I-beam construction. The members; 10 rest on a pair of angle members 12 form1ng the base ofthe device and are secured thereto by angle braces 1 The braces 14 are riveted to the members 10 and 12 for connecting them together. I 7 To properly space'the angle members. 12

as well as the uprightmembers 10 and'to.

rigidly hold them in proper position for forming a rigld rrame, I provide rods 16 extending through the angle members 12'and secured l thereto by nuts 18. Between the angle meme bers 12 and on the rods 16 are spacer tubes 20. The spacers 20 hold the base parts spaced apart and at the same time rigid. At the upper end of the side members 101 mount a press head. The press head comprises, a pair of spaced plates 22 riveted to the flanges of'the I-beams or uprights 10. The members 10, 12, 20, and 22 form a rigid press frame. A press head A,a work table, and an operating mechanism are all supported upon the press frame. I

Secured between the'plates 22 by bolts 26 is the press head A. The press head as illustratedis a castingand has a sleevelike portion 28. A press screw 24 is slidably mountedwithin the sleeve 28 of the press head A and is held against rotation'therein by pins 30 which are received in openings 32 formed in thepres's screw 24. The pins 30 slide vertically inslots 34 which are provided inthe sleeve 28. A pin 36 is inserted through the upper end of the screw 24 and limits the'downward movement thereof by engaging the upper end of the sleeve 28.

. The press scrcw24 is threaded as at 38 and a bevel gear 40 is internally screw threaded and coacts therewith and is mounted thereon.

Between the'bevel gear 40 and the sleeve 28 I- position a thrust bearing element 42 to take care of the tremendous upwardthrust exerted on the press screw 24 when my Fdevice is'in operation. The lower end of the press screw 24 is reduced as at 44 for receiving forinstance a fitting 46. The fitting 46 is provided with a socket 48 projecting over the reduced portion 44 and is held thereon by a set screw 50. The set screw 50 coacts with a groove 52 in the press screw 24. The fitting 46 is V-shaped as at 54. Manydifierent kinds of fittings may be employed upon the lower end of the press screw 24.

V I provide a work table B for my press comprising plates 56 positioned with their ends on each side of the side flanges of the upright members 10. Spacer castings 58 to which the plates 56 are riveted hold the plates spaced apart. The spacer castings 58 are positioned so that the two plates project beyond them, thus forming guides for the wprk table. The work table is guidingly held between and upon the uprights 10.

.By this construction it is obvious that the work table is capable of sliding movement is pivotally mounted. Each latch mechanism A 62 is constrained 1n one dlrection by a spring 66 whereby a lug 68 thereon is maintained in engagement with one of the slots or openings 60. Each latch mechanism '62. is provided with an extension 68 adapted to frictionally engage the web of an upright 10 to prevent sudden dropping of the work table when the latch is moved to the dotted line position shown in Figure 3. This construction adapts my'improved press for various kinds of work usually encountered about a garage in the re} pair of engines of all kinds, although my particular construction of press is best applicable for automotive work.

I provide fittings 70. and 72 for 'coacting.

with the plates 56 of the table 13. The fitting 7 O issubstantially a face plate provided with an opening 7 4. A pair of ribs 7 6 are provided 7 on the underside of the fitting 70 to properly position thefitting on the plates 56 and prevent its accldental displacement therefrom,

The ribs 7 6 at the same time permit easy sliding movement of the fitting 7 O on the table B at the will of the operator. The fitting 72 is provided with a V-notch 78 and a lug 80 extending downwardly between theplates 56 for positioning the fitting on the plates and allowing easy sliding movement of the fitlng longitudinally relative to the table B. Preferably I provlde two of the fittings 72.

Press screw actuating insular/tiara.

The mechanism whereby I rotate the bevel gear 40 for moving the press screw 24' through, the sleeve 28 will now be described in detail.

3 Secured to the web of one of side members 10, is a bearing bracket 82. Rotatably mounted in the bracket 82is a shaft 84. A downward ly extending portion 86 of the sleeve 28 is provided with an enlarged bearing 88. The bear-.

at 96 on the outer end of the shaft 84 is a ratchet hub '98. The hub 98is formed with ratchet teeth." Rotatably mounted on the ratchet hub'98 is an enlarged pawl carrying hub or fitting 100. A crank arm 102 is rotatably mounted relative to the shaft 84 by means of a shouldered cap s :':re\v"104. The

crank arm '1O2'is snugly received in. a groove 106 formed in the pawl carrying hub or fit ting 100 and is further secured thereto by means of a bolt 108. The bolt 108 extends through the crank arm and through a projection 110 formed on the hub 100. From the description of the parts just described it will be obvious that the hub 100 and crank arm 102 are free to rotate' relative to the shaft 84 and the ratchet hub 98. The crank arm 102 is provided with a handle 112 whereby the arm 102 can be actuated by an operator of, the press for rotating the shaft 84 through the ratchet'mechanism which I will now describe.

I provide a pawl 114 slidably mounted in a sleeve 116 formed on and extending upwardly from the pawl carrying hub 100.- The pawl 114 is rotatably mounted within the sleeve and has a reduced spindle 118 extending from the sleeve 116. The spindle 118 is slidably and rotatably mounted in an enlarged opening 120 in the sleeve 116 whereby a shoulder 122 is provided. A spring 124 is positioned on the spindle 118 between the pawl 114'and the shoulder 122 to normally yieldingly cause the pawl. 114 to engage the ratchet notches 126 in the ratchet hub 98.

. The pawl 114 is provided withla beveled edge 128 whereby rotation of the handle in one direction will disengage the pawl succesnotch 132 in the sleeve 116.

I will now describe the mechanism whereby rotation is transmitted from the shaft 84 to the bevel gear selectively at a high orlow ratio of speed.

Keyed to the shaft 84 by means of a key 7 134 is an eccentric member 136. Monnted on the shaft 84 is a disk 138 provided with notches 140 in its periphery. The disk 138 rotates in unison with the eccentric member 136 and consequently the shaft 84 by virtue of pins 141 extending through both the eccentrio member and the disk. Rotatably mounted on the eccentric member 136 is a gear wheel 142. The gear wheel 142 has an enlarged hub whereby a pluralityof rollers 144 may be inserted between the hub and the ec-. centric member 136 to form a. roller bearing to reduce friction.

From the foregoing it will be obvious that rotation ofthe shaft 84 will cause the gear 142 tomove eccentrically relative to the shaft but it need not necessarily rotate therewith.

'Rotatably mounted on the shaft 84 is a sleeve 146. The sleeve v146 is in operative connection with the sleeve'90 on the bevel gear 92 by'the aws 148. Integral'with the sleeve 146 is a disk 150. Secured to the disk 150 as by rivets or the like 152 is an internal gear 154.

The gear 142 is provided with teeth 156 and the internal gear 154 is provided with teeth 158 meshing therewith. The number of teeth 158 exceeds the number of teeth 156 so thata differential gearing mechanism results whenthe eccentric member 136 is rotated.

In order to rotate the sleeve 146 at a reduced. speed relative to the shaft 84 it is necessary to prevent rotation of the gear 142. I accomplish this in the following manner. 1

Pivoted between ears 160 on the gear 142 is a bell crank lever 162. The bell crank lever 162 is spring actuated in onedirection by a spring 164 for holding the lever 162 in the full line position as illustrated in Figure 3 and Figure 5. For holding thearm 162 in engagement with a roller 168 I provide a flange 170. The flange. 170 is secured to a shaft 172 which is rotatably mounted in a bracket 174 secured to the web of the side member 10 above the bearing flange 82. The shaft 172 is spool like member 17 8-is secured'to the shaft 172 on the opposite sideof the web from the bracket 174 and is adapted to be rotated and in turn rotate the flange 170 at the will of the operator. Foripreventing rotation of the shaft 172 a pin is slid-ably mounted in the flanges of the spool member 17 8 andisprovided with an enlarged portionor shoulder 182. A spring 184 is interposed between the shoulder 1'82 and the outer flange of the spool 17 8 whereby the pin180 is actuated to slide.

to position where the end 186 thereof may enan opening 188 formed in the web of one of the side members 10; Another opening 191 is providedto receive the end 186 when the spoolmember'17 8 is in another of its rotated positions relative to the position shownin Figures'3 and 6.

The flange 170 is provided with a cut-away portion 190 whereby the flange when rotated to the dotted line position illustrated in Figure 5 will allow the spring 164 to release the Lane,

disk 138. When the disk has, been rotated a suflicient distance relative to the gear 142 it brings the notches 140 to register with the end 166 of the lever. 162. The spring 164 forces theend 166 to enter any. of the notches 140.

lever 162 from the roller 168. When the lever p 162' is free to be moved by the spring 164,

end 166 thereof engages the periphery of the 90 then the latches 62 aremoved as for instance to the dotted line positionillustrated in Figure 3. The lugs 68 disengage their respective notches 60 and permit free inovement'of the table'B. The work table may be slid vertically relative to the side members 10 until the worked onythen the spool 178' is rotated to the position where the end 186 of the pin184 engages the notch .190. In this position the cut-away portion or notch 190 of theflange 170 is parallel with the arm 162 thereby allowing the arm to engage one of the notches 140 in the disk 138 as illustrated in the dotted line position in Figure 3. g

- When the parts of the gearingmechanism are in this position, rotation is transmitted from the shaft 84 through the disk 138. arm 162 and gear 142 to the gear 154 and the sleeve 146. In this position all of the parts just men *tioned rotate in unison whereby one turn of the'crank arm 102 rotates the bevel 92 in the groove 54. the press screw 21 tends to bend the sh Figure 5. The lever 162 is then manuallyv moved to the full line position and the disk 170 is rotated to the postion shown in Figure 3.

The coaction of the lever 162 and the roller 168 prevents further rotation of the gear 1&2 and the flange 170 maintains the arm in engagement with the roller. When the parts are in this position and the shaft Sa is rotated, it causes the gear 142 to move eccentrically relative to the shaft but the gear is not permitted to be rotated. Rotation of the eccentric member 136 causes the teeth 156 to suecessively mesh with the teeth 158 therebyadvancing the internal gear 154 a distance of the number of teeth there are in the gear 154 in excess of those on the gear 142. This causes a very slow rotation of the bevel. gear 92 and a consequent powerful press action on the work between the fittings 46 and 70.

In the operation of my device, the fitting 16 may be removed and the end 14 may be employed for forcing shafts from gears or the like which are placed on; the face plate 70. The shafts in such cases extend through the opening 7%. When it is desired for instance to sraightcn a shaft or the like, the two fittings.

. 2 are en'iployed in conjunction with the fitting 46. The shaft is laid in the V-grooves 78 with the high point of the bend in the shaft A downward pressure of aft toward straightened position.

Having thus described my invention, it will be obvious that I have provided a'press particularly adaptable for usein garages and which may be used for a variety of other work well. 1

I have also provided a suitable mechanism for reducing the speed at which the screw is operated whereby a great leverage is obtained.

My mechanism isso arranged whereby the gearingdown mechanism may conveniently be rendered inoperative and the press operated at high speed as for instance when ad- 7 it to the work being done.

ionic changes may be made in the details of construction and arrangement of the various parts of my invention, without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims, any modified forms ofstructure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim my invention:

1. A press of the class described comprising a frame having spaced apart upright members provided with vertically spaced aligned openin s, a work table vertically slidable on said upright members, a latch at each end of the work table adapted to selectively coact with said aligned openings in said upright members whereby the ends of the work table are supported on said upright members, said latches having portions adapted to frictionally engage the frame when they are in unlatched position.

2. A press of the class described comprising a frame having spaced apart upright members provided with vertically spaced aligned openings, a work table vertically slidable'on said upright members and guidingly held thereby, a spring actuated latch mechanism at each end of the work table, each latch comprising a pivoted member having portions, eX- tending in opposite directions beyond the pivot means, one of said portions being adapted to frictionally engage one of the upright members when the latch is in one position and the other portion having a hook thereon .on said frame for varying the distance be tween said table and press head, a latch mechanism for holding said table in any of its adjusted positions, said latch mechanism including a portion adapted to frictionally engage the frame when in unlatched position, a press screw slidably mounted in said press head, a

bevel gear threaded on the screwjbelow said press head for movement to said screw relative to said press'head, a second bevel gear coacting with the first bevel gear for supporting the press screw in said press head.

a base, a frame mounted thereon, a press head and a work table supported on said frame, a press screw slidably mounted in said press head, a bevel gear threaded on the screw below said press head for causingmovement of said screw relative tosaid press head and common means in connection with said gear for imparting rotation thereto and for supporting the press screw in said press head.

5. A press of the class described comprising a base, a frame mounted thereon, a press head and a work table supported on said frame, said work table being capable of adjustment on said frame for varying the distance between said table and press head, a latch mechanism for holding said table in any of its adjusted positions, a press screw slidably mounted in said press head, a bevel gear mounted on the screw below the press head for moving it with- 165 4. A press of the class described comprising I nectionbetween the crank and the second bevel gear. v 1

'6. A press of the class described comprising a base, a-frame mounted thereon, a press member and means for rotating said eccentric member.

- 7 A press of the class described comprise ing a base, a frame mounted thereon, a press head and a work table supported on said frame, a press screw sl-i-dably mounted in said press head, a bevel gear mounted on the screw for moving it within the press head, a second bevel gear coacting withthe first bevel gear, meansfor rotating the second bevel gear, said means comprising an internal gear, a gear mounted within said internal gear and in engagement therewith and having fewer teeth than said internal gear, an arm, means on the frame for engaging the arm for preventing rotation of the gear, an eccentric member, said gear being rotatable on said eccentric member and means for rotating saideccentric member.

8. A press of the class described comprising a base, a frame mounted thereon, a press head and a work table supported on said frame, said work table being capable of adjustment on said frame for varying the distance between said table andpress head, a latch mechanism for holding said tablein'any of its adjusted positions, a press screw slidably mounted in said press 'head, a bevel gear mounted on the'screw for moving it within the presshead, a second bevel gear coasting with'the first bevel gear, means for rotat ng the second bevel gear, sa1d means comprising an internal gear, a gear'mounted within said internal gear and in engagement therewith and having fewer teeth than said internal gear, an arm, means on the frame for engaging the arm for preventing rotation of the gear, an eccentric member, sa1d gear being rotatable on said eccentric member and means for rotating said eccentric'member.

9. A press of the class described comprising a base, aframe mounted thereon, a press head and a work table" supported on said frame, said'work table being capable of adjustment on said' frame for varying the distance between'said table and press head, a latch mechanism for *holdingisaid table in any of its adjusted positions, apre's's screw slidably mounted in said press head, a bevel gear mounted'onthe screw for moving it within the press :head, a second bevel gear coacting with the first bevel gear, means for rotating the second bevel gear, sa1d means comprising an internal gear, a gear mounted within said internal gear and in engagement, therewith and havlng fewer teeth thansaid internal gear, an arm, means on the framefor engaging the arm forpreventing rotation of the gear, an eccentric member, saidgearbeing rotatable on said eccentric member and means for rotating'said eccentric member,

said means comprising a crank and a reversible ratchet connection between the crank and the second bevel gear:

10. A press of the class described oomprising a base,.a frame' mounted thereon, a press head and a work table supported on said frame, a press screw. slidably mounted in said press head, a bevel gear'mounted' on the screw for moving it within the press head, a second bevel gear coacting with the first bevel gear, means for rotating the; second bevel gear, said means comprising an internal gear, a gear mounted within said internalgear and in engagement therewithand having fewer teeth than said internal gear," an arm secured to sa1d gear, a roller on the frame for engaging saidarm whereby rotation of the gear is prevented, an eccentric member,

said gear being rotatable on said eccentric member and means-for'rotating said eccentric member. I

11. A press of the class described comprising a base, a frame mounted thereon,a press head and aworktable supportedon said frame, a'press screw slidably mounted in said press head, a bevel gear mounted on the screw for moving it within the'press head, a second bevel gear coacting with the'firstbevel gear, means for rotating the second bevel gear, said means comprising an internal gear, a gear mounted within said internal gear and in engagement therewith and having fewer teeth than said internal gear, an arm secured tosaid gear, a rolleron the frame for engaging said arm whereby rotation of the gear is prevented, anieccentric' member, said gear being rotatable on said eccentric member and means for rotating said eccentric member, and

means for disengaging the arm from the ing a base, a frame mounted thereon, a press head and a work table supported", on said frame, a press screw operatively "supported by said press head, means coacting with said screw for operating it, vsaid means compris-i ing an'inte'rnal gear, agear mounted within said internal gear-and in engagement therewith and having fewer teeth than said internal gear, an eccentric member, said gear being rotatable on saidzeccentric I member,

means for rotating said eccentric member, a disk rotatable with the eccentric member and having notches in the periphery thereof, an

arm on said gear normally inengagement with one of said notches and means forcausing its disengagement therefrom.

113. A press of the class described comprising a base, a frame mounted thereon, a press head'and a work table supported on said frame, said work table being capable of adjustment on said frame for varying the distance between said table and press head, a latch mechanism for holding said table in any of its adjusted positions, a press screw operatively supported by said press head, means forcausing its disengagement therefrom,

14. A press of the class described comprising a base, a frame mounted thereon, a press head and a work't-able supported on said a frame, a press screw operatively supported by said press head, means coacting with said screw for operating it, said means comprising an internal gear, a gear mounted within said internal gear and in engagen'ientthercwith and having fewer teeth than the internal gear, an eccentric member, said gear being rotatable on said eccentric member, means for rotating the eccentric member, a disk rotatable with the eccentric member and having notches in'the periphery thereof, an arm on said gear, a spring for normally causing said arm to move to notch engaging posi tion and a projection on the frame forholding said arm against the action of the spring. 15. V A press of the class described comprising a base, a frame'mounted thereon, a press head and a work table supported on said frame, a press screw operatively supported by said press head, means coacting with said screw for operating it, said means comprising an'internal gear, a gear mounted therein in engagement therewith and having fewer teeth than the internal gear, an eccentric member, said gear being rotatable on the ec-' centric member, means for rotating the eccentric member, a disk'rotatable with the eccentric member and having notches in the periphery thereof, an arm on said gear, a spring for normally causing said arm to move to notch engaging position, a roller on the frame for engaging said arm when it is not'in engagement with one of said notches and a movable latch adjacent said roller for boldiugsaid arm in engagement with the roller.

16; A press of the class described compris ing a base, a frame mounted thereon, said 7 frame having spaced apart upright-members provided with vertically spacedaligned openings, a work table vertically slidable on said upright members and guidin'gly held thereby, a spring actuated latch mechanism at each end of the work table adapted to selectively coact with said aligned openings in said up-' i right members whereby the ends of the work table are supported on said upright members, a press head supported on'said frame, a press screw operatively supported by said, press head, means coacting with said screw for operating it, said means comprising an internalgear, a gear mounted therein in engagement therewith and having fewer teeth than the internal gear, an eccentric member, said gear being rotatable on the eccentric member, means for rotating the eccentric member,a disk rotatable with the eccentric membercand having notches in the periphery thereof, an arm on said gear, a spring for normally causing said arm to move to notch engaging position, a rollero'n the frame for engaging said arm when it is not in engagement with one of said notches and a movable latch adjacent said roller for holding said arm in engagement with the roller.

17. A press of the class described compris ing a base, a frame mounted thereon, said frame having spaced apart upright members provided with vertically spaced aligned openings, a work table slidably mounted on said upright members, a spring actuated latch mechanism at each, end. ofthe work table adapted to selectively coact withsaid openings whereby the work table is'supported, a press head on said upright members, a press screw slidably mounted in said press 1-05 head, a crank for actuating said press screw, means for operatively connecting the crank to the screw comprising an eccentric member operable from the crank, a gear mounted on the eccentric member, an internal gearhaving said gear received therein and in. mesh there with, said internal gear having more teeth than said gear and means for preventing rotation of the gear. 7

1 8. A press of the class described compris ing a base, a frame mounted thereon, said frame having spaced apart upright members provided with vertically spaced openings, a work table slidably mounted and guidingly held on said upright members, spring actuated latch mechanismson said work table adapted to selectively coact with said open; ings whereby'the work table is supported, a press head on saidupright members, a press screw slidably mounted therein, a crank for. I

actuatingsaid press screw relative to said press head, means for operatively connecting the crank tothe screw comprising'an eccen tric member operable from thevcrank, a gear mounted on the eccentricmember, an inter nal gear having said gear received therein and in mesh therewith, a notched disk secured means for causing disengagement of the arm from the disk, said last means serving to engage the arm and prevent rotation of the gear.

19. A press of the class described comprising a base, a frame mounted thereon, said frame having spaced apart upright members provided with vertically spaced openings, a work table slidably mounted and guidingly held on said upright members, spring actuated latch mechanisms on said work table adaptedto selectively coact with saidopenings whereby the work table is supported, a press head on said upright members, a press screw slidably mounted therein, a crank for actuating said press screw relative to said press head, means for operatively-connecting the crank to the screw comprising a reversible ratchet mechanism and an eccentric member operable from the crank, a gear mounted on r the eccentric member, an internal gear having said gear received therein and in mesh therewith, a notched disk secured to said eccentric member, an arm pivoted on said gear and spring actuated toward position for engaging a notch in said disk and means for causing disengagement of the arm from the disk, said lastmeans serving to engage the arm and v prevent rotation of the gear.

' gear.

21. device of the class described comprisi ing a frame, a shaft rotatably mounted thereon, an eccentric member and a notched disk secured to said shaft, a gear mounted on said eccentric member, an internal gear encircling said gear and meshing therewith, the teeth of said gear and internal gear being different in number, an arm on said gearre'siliently position to engage said arm when it is disengaged from said notched disk.

constrained toward position to, engage'said notched disk, and a roller on said frame in,

gear being different in number, an arm on said gear resiliently constrained toward position to engage said notched disk, a roller on said frame in position to engage said arm when it is disengaged from said notched disk,

allowj the arm to be disengaged from the flange and the roller.

23. A device ofthe class described comprising a frame, a shaft rotatably mounted relative thereto, an eccentric member, a gear, mounted on said'eccentric member, an internal gear encircling said gear and meshing therewith, the teeth of saidgear and internal gear being different in number, an arm on said gear resiliently constrained toward po-' sition to engagea portion of the eccentric member, a roller on said frame in position to engage-said arm Whenit is disengaged from said shaft, and a projection adjacent the roller for engaging the'arm and thereby maintaining its engagement with said roller.

Des Moines, Iowa,"November 4, 1926. y l LEONARD D. l s ILSON; 

